Don't know of a website but I used to deal now and then in old jewelry. Is it set with stones? Is it base metal? Are the stones Swarovski? (you can tell by the clean facets and colors). Most important of all, do you have a photo?
Never discount an item because of wear. For years I've been looking for a late Victorian piece of jewelry in any condition set with a tiny green stone which, when viewed with a loop, has a horsetail inclusion in it. That is a demantoid garnet. The stone is worth thousands. I had an antique mall for a while and one of my renters, very knowledgable in her own field, sold a piece of beat-up "costume" jewelry for $45 containing one not knowing what she had.
I can't load a picture currently but will in a couple weeks. It is a metal base and has no stones but the center has a pearlialized carved 3D rose...not sure WHAT the material is called but it shimmers. I will try to remember to get that picture of it!